package com.hp.ssoserver.Filter;

import com.hp.ssoserver.utils.JwtUtils;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.web.authentication.www.BasicAuthenticationFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Collections;

/**
 * @Author huangpeng
 * @Title 验证成功当然就是进行鉴权
 * @Package
 * @Date 2020/9/11 16:56
 * @Description
 * @Version 1.0
 */
public class JWTAuthorizationFilter extends BasicAuthenticationFilter {
    public JWTAuthorizationFilter(AuthenticationManager authenticationManager) {
        super(authenticationManager);
    }
    @Override
    protected void doFilterInternal(HttpServletRequest request,HttpServletResponse response,FilterChain chain) throws IOException, ServletException {
        String tokenHeader = request.getHeader(JwtUtils.TOKEN_HEADER);
        // 如果请求头中没有Authorization信息则直接放行了
        if (tokenHeader == null || !tokenHeader.startsWith(JwtUtils.TOKEN_PREFIX)) {
            chain.doFilter(request, response);
            return;
        }
        // 如果请求头中有token，则进行解析，并且设置认证信息
        SecurityContextHolder.getContext().setAuthentication(getAuthentication(tokenHeader));
        super.doFilterInternal(request, response, chain);

    }
    // 这里从token中获取用户信息并新建一个token
    private UsernamePasswordAuthenticationToken getAuthentication(String tokenHeader) {
        String token = tokenHeader.replace(JwtUtils.TOKEN_PREFIX, "");
        String username = JwtUtils.getUserName(token);
        String role = JwtUtils.getUserRole(token);
        if (username != null){
            return new UsernamePasswordAuthenticationToken(username, null,Collections.singleton(new SimpleGrantedAuthority(role)));
        }
        return null;
    }
}
